Most clients, in seeking to appoint co-nominees, seek to avoid intra-family conflicts. In my experience, if intra-family conflicts upon your death or incapacity hover on the horizon, then the worst thing one can do is force these two relatives to cooperate on emotionally volatile subjects, as they must when serving jointly. Making co-nominees increases, not decreases conflicts. Avoid it. Nominate your trusted loved ones serially, not jointly.